gear splitter/underdrive unit/ gear reduction device - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-26-2009
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gear splitter/underdrive unit/ gear reduction device

I know nobody makes a 5 bolt for the ranger, but could you use an adapter to go from a 5 bolt to a 6 bolt, install the gear splitter, and then just run the tcase out of an f150. Also, would the electrical components of an f150 tcase plug right up or are they setup differently then the ranger tcase (i have the electrical 1354 i think). One other question, can gear reduction units be ran in low range at higher speeds like 45 mph without any adverse effects? Thanks for any help yall.
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Old 01-26-2009
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Are you talking like a divorced t-case? Or like a crawl box?

If your planning to run a gear reduction unit, I wouldn't plan on even reaching 45 mph in low. I think I barely get up to 30 If I'm lucky. Personally I wouldn't run it for long periods of time at those speeds. There really is no need, and it will cause excess heat and wear on your t-case gears.
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Old 01-27-2009
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The reason i was considering running a crawl box is to maintain the stock gearing (4.10's) with 35's. Better way to explain it, run the crawl box/gear splitter in low in the city where acceleration is more important, then run the gear splitter in high on the highway to conserve fuel and lower rpms, all the while keeping the tcase in high. There isn't a lot of information about gear splitters which i can understand considering none are made for the ranger 5 bolt tranny/tcase
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Old 01-27-2009
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You realize that you cannot shift on the fly with a crawl box right? A crawl box will usually have a massive gear reduction. It would be like running in 4lo in town. Probably be fun as hell, but I think you will run into issues with durability. You have to realise, a crawl box or a divorced t-case, are designed to run at slow speeds on a trail, not through town. I think heat would be a big issue, especially in town at slow speeds. I have heard issues with people running doublers in their daily drivers.

As well, lower RPM's do not necessarily mean fuel savings. It is where your engine is most efficient. And I think the 4.0 is around 2400 rpm??

I would just get a set of 4.56's or stay with the 4.10's. A hell of alot cheaper, no custom fab, and you wont have issues with durability.
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Old 01-27-2009
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Gear Venders makes good overdrive units that you can shift of the fly. But they don't make anything for the Ranger.
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Old 01-28-2009
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Yeah, the next thing im gonna do is put on a set of 285/75r16 (free set with about a 1/4 tread left) when my current tires run out. The 285's will put my rpms in the 2550 to 2600 range on the highway which im hoping will help with fuel mileage considering i drive 90% on the highway at 65 mph. Now granted my low end will suffer but im hoping to compensate with a tuner. Once those tires run out I want to run 35's with a suspension lift but instead of regearing i was hoping to run a type of doubler/gear splitter to maintain highway rpms and city drivability, but its looking like it may just be cost effective and easier to regear to a 4.56 at that time. I really like splitting gears, two of our farm trucks have split rearends and they drive great b/c of the splitter. I looked at the us gear "dual range" unit, but you must be moving to switch gears, which isn't bad but can be a pain. The gear vendor unit will lock out in 4wd, which means if i get an underdrive unit and want low range on top of low range in the tcase im out of luck bt they also dont make an adapter for the ranger tcase. I looked at High Impact "Ranger" but it requires moving the tranny back and may cause problems with shifting the manual tranny. Advance adapters make an adapter to go from a 5 bolt to 6 bolt, would an f150 tcase with the gear vendor work? just throwing ideas out. Sorry for the long post, but just trying to get ideas. Thanks yall
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